In the last hundred years, tiger populations across the world have decreased; from a 60,000 population, only 3,200 were left in the wild by 2010.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/scientists-outwit-poachers-help-artificial-intelligence
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/science-world-report
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/wildlife
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/poaching
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/illegal-trade
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/scientists
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/science-and-technology
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/elephant
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rhinoceros
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/tiger
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/endangered-species